Puzzles for you

[indianbaba]

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@i_online, in view of making this thread sticky two of your puzzles have been added here and your original posts are moved.
Cheers
indianbaba.

[daviddwilson]

This thread made into Sticky. If it is not updated daily it will be removed.

@i_online, in view of making this thread sticky two of your puzzles have been added here and your original posts are moved.
Cheers
indianbaba.

It requires that the students hold both hands up, with palms facing the student. The student counts his or her thumbs and fingers consecutively
from left to right, with the thumb on the left hand representing the number 1 and the thumb on the right hand representing the number 10. To multiply n times 9, where 1 <= n <= 10 and where n is a whole number, the student bends down the nth finger. The number of fingers to the left of the bent finger represents the tens-place digit of the product, whereas the number of fingers to the right of the bent finger represents the ones-place digit of the product.

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